指令大全 - Linux 指令篇:字串处理--tr

指令大全 - Linux 指令篇:字串处理--tr
名称：tr

### 1.比方说要把目录下所有的大写档名换为小写档名?

似乎有很多方式，"tr"是其中一种:

#!/bin/sh

dir="/tmp/testdir";
files=`find $dir -type f`;
for i in $files
do
dir_name=`dirname $i`;
ori_filename=`basename $i`
new_filename=`echo $ori_filename | tr [:upper:] [:lower:]` > /dev/null;
#echo $new_filename;
mv $dir_name/$ori_filename $dir_name/$new_filename
done


### 2.自己试验中...lowercase to uppercase

tr abcdef...[del] ABCDE...[del]
tr a-z A-Z
tr '[:lower:]' '[:upper:]'

shell>> echo "this is a test" | tr a-z A-Z > www
shell>> cat www
THIS IS A TEST

### 3.去掉不想要的字串

shell>> tr -d this ### 去掉有关 t.e.s.t
this

man
man
test
e

### 4.取代字串

shell>> tr -s "this" "TEST"
this
TEST
th
TE